$\lim_{x\to\infty}\left(\frac{x^2+x}{x}\right)$
$\int\frac{-x^2-9x-1}{x+8}dx$
$\frac{1-\sin a}{\cos a}-\frac{\cos a}{1+\sin a}=2\sec a$
$a5a^2+3a^4-45a^5$
$\int ce^5dx$
$\lim_{x\to4}\left(x^3-7\right)$
$-12-\left(-59\right)$
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